Centering-mold.



APPLICATION FILED NOV. 12. 1906.

2 SHEETS-SHEET 1 d ofsssas x. PATENTED MAY 21,1907.

J,B.'BLAW.

GBNTERING MOLD.

APPLICATION TILED NOV.1Z, 1906.

2 SHEETS-SHEET z.

INVEM'WBR UNITED srn'rns a'rnn'r orrion.

JACOB B. BLAW, OF PITTSBURG, ma nu ASSIGNQR '10 BLAW COLLAPSIBLE STEEL CENTERING COMPANY, on PITTSBURG, PENN- SYLVANIA, A CORPORATION or NEW JERSEY.

' cEN rERme-MoLD.

Specification of Letters Patent.

Batented May 21, 1907.-

' Application filed November 12, 1906. Serial N0..343,00'7.,

passages of substantially reverse U or horseshoe shape in cross section; and has for its objects; to provide a mold of flexible material which may be easily collapsed and handled; to provide a mold having superior bracing and collapsing means; and finally to provide a collapsible mold of the above type having improved means for supporting the side sections. These and other objects are accomplishedby my invention one embodiment of which is illustrated in'the accompanying drawing in which,

Figure 1 is anend view of the mold, and

Figure 2 is a perspective of such mold ona reduced scale.

My device is preferably constructed of thin sheet metal which can be easily handled and further can be detached from the concrete by a gradual or peeling action. The mold is designed primarily for the larger size of horseshoe or U shaped sewer, although it could be applied to sewers of small size, and consists in the main of two opposing vertical side plates and an arched upper member adapted to-be detachablysecured to the side plates, together with collapsing and supporting means for all the sections.

Referring to the drawing, it will be seen that the mold is composed of four independent sections which are numbered 1, 1 and 2, 2, the members 1, 1 being the flat side members and the members 2, 2 being the arched ones, which arched members are detachably connected together-at their upper edges and at their lower edges are detachably secured to the upper edges of the'members 1, 1. The means for detachably connecting together the members 2, 2 is as shown, 'a butt strap 3 riveted to the left hand member and extending past the opposing member and adapted to be secured thereto by means of the loop 4 extending through the strap 3 and secured to the right hand member 2. The loop is held in the position shown by means of awedge (not shown). The lower securing means between the plates 1 and 2 are the 5 angles 5 which are riveted to 'the upper members 2 and detachably secured to the lower member 1 by means of the loop and wedge construction above described. The upper portions of the members 1 are supported by means of turn buckles 6 extending transversely of the mold and detachably engaging the angles 7 which angles are riv-. eted to the members 1. ,The turnbuckles also serve asa collapsing means for springing in the edges of the plates 1. 'The lower edges of the plates 1 are supported on the beams 8 by means of the engagement of the angles 9 therewith, which angles are secured rigidly to the edges of the plates. The'up'per members 2 are supported by the crossed turnbuckles 10, 11, 12, the turnbuckles 10 and 12 being engaged withthe angles 5 at their lower edges and with the angles 13 at their upper ends while the turnbuckle 11 extends transverselyacross the mold and en gages the angles 14, The ends of all the turn buckles tit removably into holes in the angles. The molds are ordinarily made in 5 foot lengths and require two of each of the turn buckles as indicated in the perspective view, Figure 2.

The operation in handling the mold is as followsf The floor of the sewer having been constructed along the level indicated by the dotted lines 15 in Figure 1, the beams 8 are placed in position and the plates 1 set in place thereon, and the tu rn buckle 6 adjusted to proper length, after which the concrete is placed behind the plates 1. The plates 2 are then fixed in the position shown in Figure 1 and the lower edges joined to the plates 1 and the upper'edges'secured together, after which the turn buckles are putin position and adjusted to the proper length. The placing of the'concrete about the mold is then completed and after such concrete has set the turn buckles 10 and 12 are tightened gradually peeling the metal of the plates 2 from the concrete and when a suflicient area has been released the turn buckle 11 is tightened to produce a further release. The upper portion of the mold can then be taken from the sewer and the lower plates 1 released b means of the turn buckle 6. It will be seen from the foregoing that an advantageous Ice ' provided with collapsing means stil er-em; upper edges thereol'.

proper direction with respect Lo the strain .give a certain amount of support to the upper means for support and release from the con-- crete is secured as the substaiiitially radial pull of the turn buckles 10 and 12 gives-avv positive release of the edges of" the plates 2, f2 and when the turn buckles are tightened for supporting the thin metal the resistance offered by the turn huchles is exerted in the on the mold. The lower portion oi the mold is also securely supported as the angles 5 edges of the plates 1, the turn buckles 6 stiffen the mold below the angles 5 and the engagement of the'lower edges or" the plates With the beams S prevents any displacement at this point. The construction is not restricted of course .to the use of four sections as it Would he an obvious matter in case of a very large sewer to construct the mold in a largernumbor of sections for convenience and handling.

Having thus described my linventiem and illustrated its use, What 1 claim as new l desire to secure by Letters Patent, is he following:

1. In combination, a U shaped mold rem her of flexible material comp n upper i arched portion having means 101 collar it, and a pair of sul'istantially lhit til ber's co-opcratmg with the top me the i In combination, a U shaped mold mom-- ber of flexible material comprising arched portion having means for o'- it, and a'pair of side members co x with the' top member and provioe transverse stifi'ening and (:Ullkt for the upper edges, and means '11 ing the lower edges of the side memos for preventing lateral movement there 3. In combination a shape ber of flexible mater oompri amassearehed portion having; means fo collapsing it and. a pair of side members C0-l)11Ul:tllll;I -'ith the top member and provided with transverse stiffening: :md collapsing means for the upper edges, and angle irons on the i side of the lower edges of the side members for supporting); such edges.

in comhinatiou, a U shaped mold member of flexible material comprising an upper arched portion having means for collapsing it, and a pair of side nien'ihers co-operating with the top inen'iber and yn'ovided with transverse stiffening and collapsing means for the upper edges, supporting timbers, and angle irons on the inside of the lower edges oithe side members for engaging}; the timbers.

5. in comhination, a U shaped. mold memher of flexible material comprising a pair of sub ntially flat side members having sup- 'pUlllllfl means lor the upper and lowe: (ulg'es, and collapsing means, and an upper arched portion having a pair of crossed turn buckles substantially adiul with. inspect to the arch and, adapted to spring in the edges of the ail' hed portion.

ll. lu rombination, a U shaped mold memher of flexible material comprising an upper l li ll portion having tiiiouiug and collapsone g'ingr the edges f such portion, oi suhstamtiully llat side members led at their upper eth c-s on the lower J]: the arched nivmhor, means for support rig the lower edges of the side members iti'llflil lateral movement, and a collapsing and supporting new intermediate the upper and lower edges, 1

in t' :tii'non whurliwiii, i hermmto sign my ua'u'ne in the mescn -o oi' the two suhscl'ihing uitius 

